From Gerald (Gerry) Brown, Media Consultant in Hong Kong, the latest buzz on the Digital Broadcasters market in Asia-Pacific, South Asia and the Middle East covering the latest content and hardware moves in HDTV, 3G, IPTV, Mobile TV, terrestrial radio and TV, cable TV, broadband, satellite broadcast and streaming online.

The field of switching electronics poses challenging control problems
that cannot be treated in a complete manner using traditional
modelling and controller design approaches. Class D amplifiers invite
the application of advanced hybrid systems methodologies. Nowadays,
the recent theoretical advances in the field of digital hybrid
systems are inviting both the control and the electronics communities
to revisit the model and the control issues. Motivated by this, a
novel model for Class D is outlined in this paper. As motor drives
and dc-dc conversion fields, the hybrid control theory can be applied
to the digital audio amplifier but the first step is to find the good
hybrid model to describe the system.

Portable digital electronic products are integrating more and more
multimedia capabilities. This has created great interest in
incorporating digital stereo capabilities. Thus, when considering the
power management inside a cellular phone for example, the audio
function is becoming a key player. By looking at the basics of Class
AB and D topologies, this paper is promoting the efficiency of the
new digital filterless ClassD amplifiers.